River longitudinal profile, a key morphological characteristic of the river channel, is subject to river mouth progradation. Given the increasing influence of human activities and climate change on this critical downstream control, understanding its effects on the evolution of the longitudinal profile is imperative. A general theoretical framework is proposed to quantify the relevant effects, which is tested by numerical experiment and compared with field, numerical and laboratory data from the literature. The results suggest the existence of a critical ratio of accommodation space to sediment supply of approximately 0.5, above which the typical concave upward profile tends to form. Further analyses show that sea level rise tends to increase the concavity of the longitudinal profile of a river with a relatively low equilibrium bed slope and progradation rate.

中文翻译：

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渐进河流的纵向剖面及其对海平面上升的响应

河道纵剖面是河道的主要形态特征，受河口水质的影响。鉴于人类活动和气候变化对这一关键的下游控制的影响越来越大，必须了解其对纵向剖面演变的影响。提出了一个通用的理论框架来量化相关的影响，通过数值实验进行测试，并与文献中的现场，数值和实验室数据进行比较。结果表明，容纳空间与沉积物供应的临界比率约为0.5，高于该比率通常会形成典型的凹形向上轮廓。